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I tend to lean towards a keyword-rich domain, because its undeniable that Google places a lot of weight on the presence of keywords in the name. Just search for the terms you are competing for, and you'll see that many of the top results have keywords in the domain. However, I am also a fan of getting an aged domain, with pre-existing links, that (when it was live) had something in common with the topic of the site. For this, I usually look at TDNAM's listings.